https://www.polygon.com/2018/3/6/17084886/call-of-duty-black-ops-3-infected-mode-redwood-snow

Developer Treyarch just released an update for Call of Duty: Black Ops 3, the studio’s 2015 entry in the series, adding a new game mode and a new map.

The new game mode is Infected, which first appeared in Call of Duty: Modern Warfare 3, and later appeared in Ghosts, Advanced Warfare and Infinite Warfare. Here’s Treyarch’s official description of the mode as it appears in Black Ops 3: